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Finding the Fourth Proportional to 108,587.40, 162,905.40 and 42,021.60

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Solution

The fourth proportional to 108,587.40, 162,905.40 and 42,021.60 is: 63,041.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,587.40 : 162,905.40 = 42,021.60 : x
  2. Step 2: Convert to fraction form
    108,587.40/162,905.40 = 42,021.60/x
  3. Step 3: Cross multiply
    108,587.40x = 162,905.40 × 42,021.60
  4. Step 4: Simplify right side
    108,587.40x = 6,845,545,556.64
  5. Step 5: Solve for x
    x = 6,845,545,556.64/108,587.40
  6. Step 6: Final answer
    x = 63,041.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.